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ca87c493 MP |
1 | /* Lower and optimize address expressions. |
2 | Copyright (C) 2015 Free Software Foundation, Inc. | |
3 | Contributed by Marek Polacek <polacek@redhat.com> | |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "coretypes.h" | |
24 | #include "alias.h" | |
25 | #include "predict.h" | |
26 | #include "tm.h" | |
27 | #include "function.h" | |
28 | #include "dominance.h" | |
29 | #include "cfg.h" | |
30 | #include "basic-block.h" | |
31 | #include "tree-ssa-alias.h" | |
32 | #include "symtab.h" | |
33 | #include "tree.h" | |
34 | #include "stringpool.h" | |
35 | #include "tree-ssanames.h" | |
36 | #include "fold-const.h" | |
37 | #include "gimple-expr.h" | |
38 | #include "gimple.h" | |
39 | #include "gimplify.h" | |
40 | #include "gimple-iterator.h" | |
41 | #include "gimplify-me.h" | |
42 | #include "tree-pass.h" | |
43 | ||
44 | ||
45 | namespace { | |
46 | ||
47 | const pass_data pass_data_laddress = | |
48 | { | |
49 | GIMPLE_PASS, /* type */ | |
50 | "laddress", /* name */ | |
51 | OPTGROUP_NONE, /* optinfo_flags */ | |
52 | TV_GIMPLE_LADDRESS, /* tv_id */ | |
53 | ( PROP_cfg | PROP_ssa ), /* properties_required */ | |
54 | 0, /* properties_provided */ | |
55 | 0, /* properties_destroyed */ | |
56 | 0, /* todo_flags_start */ | |
57 | 0, /* todo_flags_finish */ | |
58 | }; | |
59 | ||
60 | class pass_laddress : public gimple_opt_pass | |
61 | { | |
62 | public: | |
63 | pass_laddress (gcc::context *ctxt) | |
64 | : gimple_opt_pass (pass_data_laddress, ctxt) | |
65 | {} | |
66 | ||
67 | /* opt_pass methods: */ | |
68 | opt_pass * clone () { return new pass_laddress (m_ctxt); } | |
69 | virtual bool gate (function *) { return optimize != 0; } | |
70 | virtual unsigned int execute (function *); | |
71 | ||
72 | }; // class pass_laddress | |
73 | ||
74 | unsigned int | |
75 | pass_laddress::execute (function *fun) | |
76 | { | |
77 | basic_block bb; | |
78 | ||
79 | FOR_EACH_BB_FN (bb, fun) | |
80 | { | |
81 | for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);) | |
82 | { | |
355fe088 | 83 | gimple *stmt = gsi_stmt (gsi); |
ca87c493 MP |
84 | if (!is_gimple_assign (stmt) |
85 | || gimple_assign_rhs_code (stmt) != ADDR_EXPR | |
86 | || is_gimple_invariant_address (gimple_assign_rhs1 (stmt))) | |
87 | { | |
88 | gsi_next (&gsi); | |
89 | continue; | |
90 | } | |
91 | ||
92 | /* Lower ADDR_EXPR assignments: | |
93 | _4 = &b[i_9]; | |
94 | into | |
95 | _1 = (sizetype) i_9; | |
96 | _7 = _1 * 4; | |
97 | _4 = &b + _7; | |
98 | This ought to aid the vectorizer and expose CSE opportunities. | |
99 | */ | |
100 | ||
101 | tree expr = gimple_assign_rhs1 (stmt); | |
102 | HOST_WIDE_INT bitsize, bitpos; | |
103 | tree base, offset; | |
104 | machine_mode mode; | |
105 | int volatilep = 0, unsignedp = 0; | |
106 | base = get_inner_reference (TREE_OPERAND (expr, 0), &bitsize, | |
107 | &bitpos, &offset, &mode, &unsignedp, | |
108 | &volatilep, false); | |
109 | gcc_assert (base != NULL_TREE && (bitpos % BITS_PER_UNIT) == 0); | |
110 | if (offset != NULL_TREE) | |
111 | { | |
112 | if (bitpos != 0) | |
113 | offset = size_binop (PLUS_EXPR, offset, | |
114 | size_int (bitpos / BITS_PER_UNIT)); | |
115 | offset = force_gimple_operand_gsi (&gsi, offset, true, NULL, | |
116 | true, GSI_SAME_STMT); | |
117 | base = build_fold_addr_expr (base); | |
118 | base = force_gimple_operand_gsi (&gsi, base, true, NULL, | |
119 | true, GSI_SAME_STMT); | |
355fe088 | 120 | gimple *g = gimple_build_assign (gimple_assign_lhs (stmt), |
ca87c493 MP |
121 | POINTER_PLUS_EXPR, base, offset); |
122 | gsi_replace (&gsi, g, false); | |
123 | } | |
124 | gsi_next (&gsi); | |
125 | } | |
126 | } | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | } // anon namespace | |
132 | ||
133 | gimple_opt_pass * | |
134 | make_pass_laddress (gcc::context *ctxt) | |
135 | { | |
136 | return new pass_laddress (ctxt); | |
137 | } |